import javax.servlet.annotation.WebListener;
import javax.servlet.http.HttpSessionAttributeListener;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionListener;
//@WebListener
public class bbb implements HttpSessionAttributeListener {
    public void attributeAdded(HttpSessionBindingEvent httpSessionBindingEvent) {
        System.out.println("attributeAdded");
    }

    public void attributeRemoved(HttpSessionBindingEvent httpSessionBindingEvent) {
        System.out.println("attributeRemoved");
    }

    public void attributeReplaced(HttpSessionBindingEvent httpSessionBindingEvent) {
        System.out.println("attributeReplaced");
    }
}
